Dd13 not well is it her asthma?

Hi all this is probably going to end up being a very long post but just not sure what to do really. When my daughter was very young she has asthma not that bad, and she never had an attack. Anyway when she was about 8 it went and she was fine up until a few months ago when we noticed she had a cough that got worse at night. The doctors gave her an inhaler but they didn't actually say it was asthma until I got a letter saying she had a referal to an asthma clinic. Anyway we missed the appointment and I have been meaning to make a new one, but it hasn't been that bad just a bit of a cough now and then. Then she come home yesterday night saying she didn't feel too good and felt weak, a few hours later she was coughing non stop, she took a few puffs of her inhaler which she hasn't had to use for ages. Kept on coughing through the night, and finally fell asleep at 4!! She came down a few hours ago saying her chest feels a bit tight and still coughing and breathing quite fast. She has now gone back to sleep and seems okay I'm checking on her often! So now I'm just not sure what to do, non of the doctors are open and I don't know whether this really is her asthma as it has never been that bad or that much of a problem? Sorry again for long post, thanks x